13 BISC 120_MolecularSyst

13 BISC 120_MolecularSyst - Catalina Semester Info Sessions...

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1 1 Catalina Semester Info Sessions • 12 noon W 9/22 (today!) and F 10/1 in AHF 107 • Free lunch! 2 Reminders • No Blackboard quiz this week • Midterm #1 is Wed. Sept 29 – Covers lectures 3-14 (Edmands) – Practice questions posted on Blackboard • SI review session is Sun. Sept 26 7-9pm – SGM 123 and 124 3 Some students are still using unregistered clickers!!! • Please, please, please go to Blackboard and check your scores (Tools > My Grades) to see if you are receiving your clicker points. Insights from Molecular Systematics 26.4 - 26.6
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2 5 6 Molecular trees span both short and long periods of time because molecules evolve at different rates 7 Conserved sequences like ribosomal RNA (rRNA) resolve deep divergences 8 Rapidly evolving sequences like mitochondrial DNA (mtDNA) resolve more recent divergence “mtEve”
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3 9 Molecular phylogenies rely on two types of homologous genes: orthologous and paralogous 10 A B C D Ancestral species A B C D A B C C 1 D Species 1 Species 2 Orthologous (Used to build species trees) Paralogous (Used to reconstruct gene family expansions) 11 Some duplicate genes become ‘junk”, others have important functions 12 Gene number does not predict complexity Rice: 40,000 - 50,000 Mustard weed: 25,500 Pufferfish: 21,000 Human: 20,000 - 25,000 Nematode: 20,000
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4 13 Molecular phylogenies track evolutionary time if we assume a molecular clock 14 Molecular Clocks • The molecular clock is a yardstick for
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This note was uploaded on 10/05/2010 for the course BISC 13004 at USC.

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13 BISC 120_MolecularSyst - Catalina Semester Info Sessions...

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